Priprava i toplinska karakterizacija polimernih mješavina na osnovi polipropilena (PP) i linearnog polietilena niske gustoće (LLDPE)

master's thesis

• Title (english): Preparation and thermal characterization of polymer blends based on polypropylene (PP) and linear low density polyethylene (LLDPE)
• Author: Karolina Tolo
• Mentor: Emi Govorčin Bajsić (mentor)
• Committee member: Emi Govorčin Bajsić (predsjednik povjerenstva)
• Committee member: Ljerka Kratofil Krehula (član povjerenstva)
• Committee member: Nevenka Vrbos (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-06-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U današnje vrijeme sve više se istražuje mješljivost različitih polimera, kako bi se njihovom modifikacijom dobili novi materijali, boljih svojstava u odnosu na čiste polimere. Cilj ovoga rada bio je pripraviti i toplinski karakterizirati polimerne mješavine na osnovi polipropilena (PP) i linearnog polietilena niske gustoće (LLDPE). Mješavine LLDPE/PP pripravljene su umješavanjem u dvopužnom ekstruderu Rondol 21 mm LAB TWIN u omjerima: 10/90, 20/80, 30/70, 40/60, 50/50, 60/40, 70/30, 80/20, 90/10. Pripravljene LLDPE/PP mješavine karakterizirane su diferencijalnom pretražnom kalorimetrijom (DSC) te termogravimetrijskom analizom (TGA) u cilju određivanja toplinskih svojstava. DSC tehnika korištena je u cilju određivanja utjecaja različitog udjela LLDPE-a i PP-a na procese tijekom taljenja i kristalizacije sustava mješavina, dok se primjenom TGA tehnike pratila toplinska razgradnja mješavina. Na osnovi DSC rezultata dobivenih za LLDPE/PP mješavine temperatura taljenja ukazuje da postoje određeni stupanj interakcija između LLDPE-a i PP-a , također se i temperatura kristalizacije PP smanjuje dodatkom LLDPE-a. TGA rezultati pokazuju bolju toplinsku stabilnost LLDPE/PP mješavina u odnosu na čisti LLDPE i PP uslijed postojanja odgovarajućih interakcija između LLDPE i PP.

Abstract (english)

The miscibility of different polymers is being highly investigated in order to modification their properties to obtain new polymer materials with better properties compared to the neat polymers. The aim of this work was to prepare and thermaly characterization polymer blends based on polypropylene (PP) and low density polyethylene (LLDPE). The LLDPE/PP blends were prepared using a Rondol 21mm LAB TWIN twin–screw extruder in the content of: 10/90, 20/80, 30/70, 40/60, 50/50, 60/40, 70/30, 80/20, 90/10. Prepared LLDPE/PP blends were characterized by differential scanning calorimetry (DSC) and termogravimetric analysis (TGA). Using DSC is aimed at revealing the effects of different blending ratios of PP and LLDPE on the melting and crystallinity behaviour of the blend systems, while the application of TGA is to study the degradation characteristics of the blends. According to DSC results for LLDPE/PP blends melting point (Tm) indicated that there was some degree of interaction between LLDPE and PP, also the (Tc) of PP trends to decreased slightly with addition of LLDPE. The TGA results show that the LLDPE/PP blends are more thermally stable than the neat LLDPE and PP due to some interactions between LLDPE and PP.

• Keywords: polimerne mješavine; LLDPE; PP; ekstrudiranje; DSC; TGA
• Keywords (english): polymer blends; LLDPE; PP; extrusion; DSC; TGA
• Language: croatian
• URN:NBN: urn:nbn:hr:149:361039
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2020-06-30
• Created on: 2022-04-20 12:30:06